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NHIE_ Electrical System — Exam QuestionsCOMPLETE SOLUTIONS GRADED A+
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11/2/24, 12:44 AM NHIE: Electrical System — Exam Questions Flashcards | QuizletNHIE: Electrical System — Exam Questions COMPLETE
SOLUTIONS GRADED A+
Terms in this set (96)
Service entrance conductors run from the - True
service drop to the service box or service
panel. True of false?
The service size is determined by the - True
amperage and the voltage ratings of the
service.
Is the service drop overhead or - Overhead
underground?
Are service laterals overhead or - Underground
underground?
The drip loop is typically part of the service - False
drop. True or False?
The wire size for the service drop must be - False
the same as the wire size for the service
entrance conductors. True or False?
How many wires would you typically find in -3
a 240-volt service drop?
What would 4 wires mean? - 3-phase electricity
What would 2 wires usually mean? - 120 volt service
1. Overhead wires too low.
2. Damaged or frayed wires.
3. Trees or vines interfering with wires.
List 7 common problems with service
4. Wires too close to doors or windows.
drops.
5. Wires not well-secured to the house.
6. Poor connection between service drop and service entrance.
7. Inadequate clearance from roofs.
Clearances above:
- Roadway 18 ft
- Driveway 12 ft.
List clearances above ground, swimming - Walkway 10 ft.
pools, and roofs. - Flat roof 10 ft.
- Sloped roof (e.g., > 4:12) 18 in.
- Low slope roof (e.g., < 4:12) 3 ft.
- Swimming pool 22.5 ft
The service entrance conductors run from - Service drop to service box
the _________ to the __ _.
All service entrance conductors must be in - False
conduit. True or False?
All service entrance conductors must be - False
attached above roof level. True or False?
The drip loop should be as close to the - False
roof as possible. True or False?
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, 11/2/24, 12:44 AM NHIE: Electrical System — Exam Questions Flashcards | Quizlet
1. No drip loop
2. No mast head
3. Mast head not weather tight.
4. Mast or conduit bent.
List 10 common problems with service 5. Mast or conduit rusted.
entrance conductors. 6. Mast rotted (if wood).
7. Mast conduit or cable not well secured.
8. Mast conduit or cable not weather tight.
9. Conduit or cable not well sealed at house/wall penetration.
10. Cable frayed, damaged, or covered by siding.
1. conduit joints
2. mast head
List 4 common areas of water penetration
3. roof flashing
into service entrances.
4. meter base
5. house entry
1. Prevents water entry into the conduit or service entrance conductors.
List 2 functions of the drip loop.
2. Shows that the service drop wires are not straining the splices.
Roughly 999 out of 1000 houses have - 240 volts
_ ____ volts available.
Roughly 999 out of 1000 houses have - 3 service entrance wires
_ ____ service entrance wires.
Load calculations are part of a home - False
inspection.
Implications of an undersized service - e.
include:
a. shock hazard
b. fire hazard
c. shock and fire hazard
d. melting insulation
e. nuisance tripping of the main fuses and
breakers
What is the largest single-phase service - 400 amps
that you are likely to find in a home?
What size copper wire would you expect a. 6 gauge
to find on the service entrance for: b. 4 gauge
a. 60-amp service c. 2-0 gauge
b. 100-amp service
c. 200-amp service
Which of the following is a reliable way to - d.
identify the service size?
a. Size of the service drop wires
b. Distribution panel rating
c. Service box rating
d. Service entrance conductor
e. Service entrance conduit size
Aluminum is an acceptable service - True
entrance conductor material. True or
False?
A fused 200-amp service has two 100-amp - False
fuses in the service box. True or False?
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